CVE-2022-50224
Estado: AnalizadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
KVM: x86/mmu: Treat NX as a valid SPTE bit for NPT
Treat the NX bit as valid when using NPT, as KVM will set the NX bit when the NX huge page mitigation is enabled (mindblowing) and trigger the WARN that fires on reserved SPTE bits being set.
KVM has required NX support for SVM since commit b26a71a1a5b9 ("KVM: SVM: Refuse to load kvm_amd if NX support is not available") for exactly this reason, but apparently it never occurred to anyone to actually test NPT with the mitigation enabled.
Detalles técnicos trazas, registros y código del informe original
------------[ cut here ]------------ spte = 0x800000018a600ee7, level = 2, rsvd bits = 0x800f0000001fe000 WARNING: CPU: 152 PID: 15966 at arch/x86/kvm/mmu/spte.c:215 make_spte+0x327/0x340 [kvm] Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 10.48.0 01/27/2022 RIP: 0010:make_spte+0x327/0x340 [kvm] Call Trace: <TASK> tdp_mmu_map_handle_target_level+0xc3/0x230 [kvm] kvm_tdp_mmu_map+0x343/0x3b0 [kvm] direct_page_fault+0x1ae/0x2a0 [kvm] kvm_tdp_page_fault+0x7d/0x90 [kvm] kvm_mmu_page_fault+0xfb/0x2e0 [kvm] npf_interception+0x55/0x90 [kvm_amd] svm_invoke_exit_handler+0x31/0xf0 [kvm_amd] svm_handle_exit+0xf6/0x1d0 [kvm_amd] vcpu_enter_guest+0xb6d/0xee0 [kvm] ? kvm_pmu_trigger_event+0x6d/0x230 [kvm] vcpu_run+0x65/0x2c0 [kvm] kvm_arch_vcpu_ioctl_run+0x355/0x610 [kvm] kvm_vcpu_ioctl+0x551/0x610 [kvm] __se_sys_ioctl+0x77/0xc0 __x64_sys_ioctl+0x1d/0x20 do_syscall_64+0x44/0xa0 entry_SYSCALL_64_after_hwframe+0x46/0xb0 </TASK> ---[ end trace 0000000000000000 ]---
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.19%
- Percentil entre todas las CVEs puntuadas: 8
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- NVD-CWE-noinfo
Referencias
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86/mmu: Treat NX as a valid SPTE bit for NPT\n\nTreat the NX bit as valid when using NPT, as KVM will set the NX bit when\nthe NX huge page mitigation is enabled (mindblowing) and trigger the WARN\nthat fires on reserved SPTE bits being set.\n\nKVM has required NX support for SVM since commit b26a71a1a5b9 (\"KVM: SVM:\nRefuse to load kvm_amd if NX support is not available\") for exactly this\nreason, but apparently it never occurred to anyone to actually test NPT\nwith the mitigation enabled.\n\n ------------[ cut here ]------------\n spte = 0x800000018a600ee7, level = 2, rsvd bits = 0x800f0000001fe000\n WARNING: CPU: 152 PID: 15966 at arch/x86/kvm/mmu/spte.c:215 make_spte+0x327/0x340 [kvm]\n Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 10.48.0 01/27/2022\n RIP: 0010:make_spte+0x327/0x340 [kvm]\n Call Trace:\n <TASK>\n tdp_mmu_map_handle_target_level+0xc3/0x230 [kvm]\n kvm_tdp_mmu_map+0x343/0x3b0 [kvm]\n direct_page_fault+0x1ae/0x2a0 [kvm]\n kvm_tdp_page_fault+0x7d/0x90 [kvm]\n kvm_mmu_page_fault+0xfb/0x2e0 [kvm]\n npf_interception+0x55/0x90 [kvm_amd]\n svm_invoke_exit_handler+0x31/0xf0 [kvm_amd]\n svm_handle_exit+0xf6/0x1d0 [kvm_amd]\n vcpu_enter_guest+0xb6d/0xee0 [kvm]\n ? kvm_pmu_trigger_event+0x6d/0x230 [kvm]\n vcpu_run+0x65/0x2c0 [kvm]\n kvm_arch_vcpu_ioctl_run+0x355/0x610 [kvm]\n kvm_vcpu_ioctl+0x551/0x610 [kvm]\n __se_sys_ioctl+0x77/0xc0\n __x64_sys_ioctl+0x1d/0x20\n do_syscall_64+0x44/0xa0\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\n </TASK>\n ---[ end trace 0000000000000000 ]---"
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"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: x86/mmu: Tratar NX como un bit SPTE válido para NPT. Se trata el bit NX como válido al usar NPT, ya que KVM lo activará cuando la mitigación de páginas enormes de NX esté habilitada (¡increíble!) y activará la advertencia que se activa al activarse los bits SPTE reservados. KVM ha requerido compatibilidad con NX para SVM desde el commit b26a71a1a5b9 (\"KVM: SVM: Rechazar la carga de kvm_amd si la compatibilidad con NX no está disponible\") precisamente por esta razón, pero aparentemente a nadie se le ocurrió probar NPT con la mitigación habilitada. ------------[ cortar aquí ]------------ spte = 0x800000018a600ee7, nivel = 2, bits rsvd = 0x800f0000001fe000 ADVERTENCIA: CPU: 152 PID: 15966 en arch/x86/kvm/mmu/spte.c:215 make_spte+0x327/0x340 [kvm] Nombre del hardware: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 10.48.0 27/01/2022 RIP: 0010:make_spte+0x327/0x340 [kvm] Rastreo de llamadas: tdp_mmu_map_handle_target_level+0xc3/0x230 [kvm] kvm_tdp_mmu_map+0x343/0x3b0 [kvm] direct_page_fault+0x1ae/0x2a0 [kvm] kvm_tdp_page_fault+0x7d/0x90 [kvm] kvm_mmu_page_fault+0xfb/0x2e0 [kvm] npf_interception+0x55/0x90 [kvm_amd] svm_invoke_exit_handler+0x31/0xf0 [kvm_amd] svm_handle_exit+0xf6/0x1d0 [kvm_amd] vcpu_enter_guest+0xb6d/0xee0 [kvm] ? kvm_pmu_trigger_event+0x6d/0x230 [kvm] vcpu_run+0x65/0x2c0 [kvm] kvm_arch_vcpu_ioctl_run+0x355/0x610 [kvm] kvm_vcpu_ioctl+0x551/0x610 [kvm] __se_sys_ioctl+0x77/0xc0 __x64_sys_ioctl+0x1d/0x20 do_syscall_64+0x44/0xa0 entry_SYSCALL_64_after_hwframe+0x46/0xb0 ---[ fin de seguimiento 0000000000000000 ]---"
}
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"lastModified": "2026-06-17T05:23:00.910",
"configurations": [
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